package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    @Autowired
    private DishMapper dishMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前放入到购物车中的商品是否已经存在了
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        Long userid = BaseContext.getCurrentId();
        shoppingCart.setUserId(userid);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        //如果已经存在了，只需要将数量加一
        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNubmerById(cart);
        } else {
            //如果不存在，插入数据，数量就是1

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCart.getDishId();
            Long setmealId = shoppingCart.getSetmealId();
            if (dishId != null) {
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setName(dish.getName());
                shoppingCart.setDishFlavor(shoppingCartDTO.getDishFlavor());
            } else {
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setName(setmeal.getName());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }


    }

    /**
     * 查看购物车
     *
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userid = BaseContext.getCurrentId();
        return shoppingCartMapper.listShoppingCart(userid);
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userid = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userid);
    }

    /**
     * 删除购物车中一个商品
     *
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //而这里不行
        Integer number1 = shoppingCart.getNumber();

        //这一步是将当前登录用户的购物车相同套餐或菜品查询出来，这里通过数据库已经将number赋值了
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            shoppingCart = list.get(0);

            //所以这里可以获取购物车中的商品份数
            Integer number = shoppingCart.getNumber();

            if (number == 1) {
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.clean(BaseContext.getCurrentId());
            } else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNubmerById(shoppingCart);
            }
        }
    }
}
